We will be in Florence for just two nights, and have friends that recommended restaurants that they loved. Acqua al 2 (tel. 055-284-170) and Antico Ristorante Paoli (tel 055 216215, Via dei Tavolini 12/r. I have heard a lot about Aqua al 2 but haven't heard about Antico Ristorante Paoli much. I hope our experience will be as good as theirs.